25798804813 has 2 divisors, whose sum is σ = 25798804814. Its totient is φ = 25798804812.

The previous prime is 25798804793. The next prime is 25798804817. The reversal of 25798804813 is 31840889752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25689037284 + 109767529 = 160278^2 + 10477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25798804813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25798804817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12899402406 + 12899402407.

It is an arithmetic number, because the mean of its divisors is an integer number (12899402407).

Almost surely, 2^25798804813 is an apocalyptic number.

It is an amenable number.

25798804813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25798804813 is an equidigital number, since it uses as much as digits as its factorization.

25798804813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 25798804813 in words is "twenty-five billion, seven hundred ninety-eight million, eight hundred four thousand, eight hundred thirteen".